The conspiracy theories are getting really silly. There is no reason Battle.net would be any less secure than the old login system. The keyloggers are getting better all the time, even net-savvy people can get hacked these days. Get an AUTHENTICATOR if you value your account! Claiming the blizzard servers are being compromised is just ridiculous.

As for people knowing your email and thus your login this is not really an issue either since your login was never meant to be a secret like your password is. When you login your name is displayed but your pass is not, you can choose to save your name on your computer but not your password, when you contact blizz customer service they may ask for your login name but never your password, etc, etc. The password is secret, the login name is not.

However I'm pretty sure the nov 12 date is not a firm cutoff. They are obviously keeping a close eye on how many people have merged and if there is still a large portion that haven't done so when nov 12 rolls around then they will no doubt extend it. Note that the forum whiners do not constitute "a large portion" no matter how vocal they are.

In the end blizz have to do this since the bnet platform will be so important going forward, I'm sure they're kicking themselves for not having the foresight to do this five years ago.